乳业科学与技术 ›› 2025, Vol. 48 ›› Issue (5): 67-71.DOI: 10.7506/rykxyjs1671-5187-20250609-042

• 分析检测 • 上一篇    

气相色谱-质谱联用测定乳粉中三聚氰胺残留量的不确定度评定

张婷,王舒婷,李嘉,车彦卓,凌莉,程用斌   

  1. (陕西省农业检验检测中心,陕西 西安 710000)
  • 发布日期:2025-10-24

Uncertainty Evaluation for the Determination of Melamine Residue in Milk Powder by Gas Chromatography-Mass Spectrometry

ZHANG Ting, WANG Shuting, LI Jia, CHE Yanzhuo, LING Li, CHENG Yongbin   

  1. (Agricultural Inspection and Testing Center of Shaanxi province, Xi’an 710000, China)
  • Online:2025-10-24

摘要: 目的:评定气相色谱-质谱联用测定乳粉中三聚氰胺残留量的不确定度。方法:依据GB/T 22238—2008《原料乳与乳制品中三聚氰胺检测方法》中的气相色谱-质谱联用法,结合CNAS-GL006:2019《化学分析中的不确定度评估指南》,建立数学模型,对实验过程中不确定度来源进行分析和评定,并计算各不确定度得到的合成标准不确定度。结果:当样品中三聚氰胺含量为2.090 mg/kg时,其扩展不确定度为0.182 mg/kg(k=2)。结论:检测结果的不确定度来源于样品定容、标准溶液配制和标准曲线拟合及实验过程中的加标回收率3 个分量。

关键词: 三聚氰胺;气相色谱-质谱联用法;不确定度评定

Abstract: Objective: To evaluate the uncertainty for the determination of melamine residue in milk powder by gas chromatography-mass spectrometry (GC-MS). Methods: Following the Guidance on quantifying uncertainty in chemical analysis (CNAS-GL006: 2019), a mathematical model was established to analyze and evaluate the sources of uncertainty in the determination of melamine residue in milk powder by GC-MS according to the Chinese National Standard Determination of melamine in raw milk and dairy products (GB/T 22238-2008). The combined standard uncertainty was calculated from the uncertainty components. Results: The melamine content of the milk powder sample was determined to be 2.090 mg/kg with an extended uncertainty of 0.182 mg/kg (k = 2). Conclusion: The uncertainty mainly came from sample volume adjustment, sample recovery, standard solution preparation and curve fitting.

Key words: melamine; gas chromatography-mass spectrometry; evaluation of uncertainty

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